# Using Crosstab Formulas

Crosstab formula is a type of extended formula used only in crosstabs in page reports based on query resources. By using crosstab formulas, you can create custom aggregate functions in a crosstab to get the desired results. Crosstab formulas are private resources on the crosstab level. They cannot be used beyond its crosstab.

Below is a list of the sections covered in this topic:

## Applying Custom Aggregate Functions

The following example shows how to apply custom aggregate function in a crosstab simply by creating a crosstab formula:

- Open the catalog file SampleReports.cat in
`<install_root>\Demo\Reports\SampleReports`

. - Select
**File**>**New**>**Page Report**. - In the Select Component for Page Report dialog, select
**Crosstab**and select**OK**. The Crosstab Wizard appears. - In the Data screen, select the query
**WorldWideSales**in Data Source 1 of the catalog. - In the Display screen, add
**Country**as the row field and**Region**as the column field. - Select
**<New Crosstab Formula...>**in the Crosstab Formulas node in the Resources box. - In the Enter Crosstab Formula Name dialog, input
**CustomAggregate**and select**OK**. The Crosstab Formula Editor is displayed. - Define the formula as follows:
`currency ctsv1 = @(Sum(@Price)); currency ctsv2 = @(@Country:ALL,@Region:ALL,Sum(@Price)); if(ctsv1/ctsv2 >0.005) return ToText(ctsv1) else`

return "N/A" - Save the crosstab formula and add it to the Summaries box as the aggregate field.
- Switch to the
**Style**screen and select**Neutral**as the report style from the Style list. - Select
**Finish**to create the crosstab and preview it. The crosstab is shown somewhat as follows. You can see that in the aggregate cell, based on the formula expression, "N/A" is displayed if the price value equals to or is less than 5‰ of the grand total price $16,337.85, while the actual price is displayed if the price is more than 5‰ of the grand total price.

## Managing Crosstab Formulas

You can manage the crosstab formulas of a crosstab in the Data panel as follows:

**Creating crosstab formulas**

To create a crosstab formula, select**<New Crosstab Formula...>**in the Crosstab Formulas node, enter a name for the crosstab formula in the Enter Crosstab Formula Name dialog and select**OK**, then in the Crosstab Formula Editor, compose the formula as required. You can then insert the crosstab formula as aggregate field to the crosstab or use it to control the properties of objects in the crosstab.**Editing a crosstab formula**

To edit a crosstab formula, select it from the Crosstab Formulas node, then right-click the crosstab formula and select**Edit Formula**on the shortcut menu. In the Crosstab Formula Editor, edit the crosstab formula as required.**Deleting a crosstab formula**

To delete a crosstab formula, right-click the crosstab formula and select**Delete**from the shortcut menu.**Renaming a crosstab formula**

To rename a crosstab formula, right-click the crosstab formula and select**Rename**from the shortcut menu. Input a new name in the Enter Crosstab Formula Name dialog and select**OK**to confirm the change.**Viewing properties of a****crosstab formula**

To view the properties of a crosstab formula, right-click the crosstab formula and select**Properties**to show the Properties table.

**Notes:**

- Crosstab formulas can only be used as aggregate fields in a crosstab.
- Global variables are not supported in crosstab formulas.
- Crosstab formulas cannot reference detail fields and record level pass one formulas, except for referencing them in simple Sum expression.
- In crosstab formulas, the Array functions cannot be used as array_function (field_variable, groupby). Here array_function refers to any Array function defined in Logi JReport. For example, Maximum(@dbfield, "group_field") and Average(@formula, @parameter) are not allowed in crosstab formulas.

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